^Klein, D.E.; Moreira Gomes, V.; Da Silva-Neto, S.J.; Da Cunha, M. (2004), "The Structure of Colleters in Several Species of Simira (Rubiaceae)", Annals of Botany, 94 (5): 733–740, doi:10.1093/aob/mch198, PMC4242219, PMID15374836
^Hickey, M.; King, C. (2001), The Cambridge Illustrated Glossary of Botanical Terms, Cambridge University Press